Need help solving 0 = −x^2 + 2.5x + 1
I have this formula, but I have no idea how to plug it in or how to write it down or what to do with the 2.5
Any help would be MUCH appreciated.
H(t) = -16^2 + vt + s

Question

Need help solving 0 = −x^2 + 2.5x + 1
I have this formula, but I have no idea how to plug it in or how to write it down or what to do with the 2.5
Any help would be MUCH appreciated.
H(t) = -16^2  + vt + s

anonymous · Answer

$$ 0 = −x^2 + 2.5x + 1$$
$$10x^2-25x+10=0$$
$$2x^2-5x+2=0$$now if you can factor, then factor, if not use the quadratic formula

anonymous · Answer

this one actually factors as $(x-2)(2x-1)=0$ so the rest should be ok

anonymous · Answer

I don't understand how you got 10x^2, 25, and 10. Did you multiply by 10?

directrix · Answer

@satellite multiplied every member of the first equation by 10 to clear the decimals.

anonymous · Answer

i hate decimals

anonymous · Answer

then divide by the common factor of 5

anonymous · Answer

When you factor, aren't you supposed to find the product of the last term and the sum of the middle term? When I did that, it said that -2 *-1 = 2 but 2 + -1 = -3
I checked it on Wolfram and it said that (x−2)(2x−1) was right, but is there something I'm missing?

anonymous · Answer

yes, the leading coefficient is 2, not 1, so that whole "sum product" business needs to be readjusted

anonymous · Answer

I've been trying to write and rewrite the equation from factoring but even when I rearrange it, I can't get -5 from -1 and -2.